Solubilised Vat Violet 2

Preparation

(a) in the presence of Pyridine , with Chlorosulfonic acid treatment C.I. Vat Violet 2 leuco; (b) in the Pyridine with metal (such as copper, iron, zinc, etc) and Sulfur trioxide source (such as Sulfur trioxide, Chlorosulfonic acid or Methyl chlorosulfonate, etc.) processing C.I. Vat Violet 2?. The above two kinds of situation after alkaline, filter out insolubles, remove Pyridine and salting out.

Properties and Applications

brilliant red light purple. Purple powder. Soluble in water for red light purple, phenolphthalein is alkaline, insoluble in Etanol and organic solvent, in light and acid under the action of not easy decomposition. Used for dyeing cotton fabric for brilliant red light purple. In neutral or weak alkaline dyeing bath dyeing. Can be used for cotton fabric of direct, resist, white discharge printing, also can be used for silk and wool dyeing.